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Resin bonded sorbent

a sorbent and resin technology, applied in the field of resin bonded sorbent, can solve the problems of degrading or reducing the strength of the molded object fabricated therewith, and achieve the effect of high moisture adsorption properties

Inactive Publication Date: 2009-09-29
MULTISORB TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It is therefore a principal object of the invention to provide improved multifunctional resinous molding compositions with a high level of moisture adsorbing properties without substantial trade-offs in mechanical properties.
[0007]The present invention comprises at least a “resin bonded sorbent” composition comprising a resin and a sufficient amount of sorbent to remove moisture from the environment the molded article will be used in. That is to say, one principal aspect of the invention relates to multifunctional molding compositions having at least a moisture adsorbing amount of a sorbent in combination with a resin. The sorbent-resin combination is present in the composition as a resin bonded sorbent. The molding composition is further characterized by enhanced mechanical properties in the absence of an additive having a utility generally recognized for reinforcing articles of manufacture fabricated from resinous molding compositions.
[0008]The invention further relates to multifunctional sorbent-resin molding compositions comprising moisture adsorbing-mechanical property enhancing amounts of adsorbent in combination with reinforcing additives and resin, wherein reduced amounts of reinforcing additives can be employed than otherwise normally required for enhanced mechanical properties. Surprisingly, these inventors discovered that mechanical properties of molding resins can be enhanced with the introduction of sorbents / desiccants thereby allowing for the introduction of reduced amounts of further additives specifically intended for enhancing mechanical properties of sorbent modified injection molding resins, such as glass fibers and glass beads. This is believed to be especially significant because with higher loadings of molding compositions with reinforcing agents this can actually have a deleterious or degrading effect on the strength of molded articles fabricated therewith. Accordingly, it is a further object of the invention to provide for sorbent-containing molding compositions wherein the mechanical properties imparted by the adsorbent enables usage of lesser amounts of mechanical strength enhancing additives specifically intended for reinforcing resinous molding compositions.

Problems solved by technology

This is believed to be especially significant because with higher loadings of molding compositions with reinforcing agents this can actually have a deleterious or degrading effect on the strength of molded articles fabricated therewith.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041]Test samples of resin bonded sorbents were prepared according to the claimed invention employing the following protocols. The resins are procured from a supplier in pellet form (most common is cylindrical (0.03-0.12 inch diameter×0.06-0.25 inch long), other forms included tear drop format (0.06-0.19 inch). The ratio of molecular sieve to the resin is determined by weight of the components. The resin was premixed in a poly bag by hand (5-15 min). The pre-blend was emptied into the hopper of a Brabender single screw extruder. Action from the screw further blends and melts the resin and molecular sieve as it travels through the extruder barrel. The resin bonded sorbent then exits through the single strand die (1 circular hole) at the end of the extruder forming one strand of molten material. The nylon based resin was heated above 262° C. The strand was then cooled by air. The strands were broken into pieces. The pieces were placed in a hopper of an injection molding machine and p...

example 2

[0048]Further experiments were performed using compositions comprising polypropylene, namely Huntsman Polypropylene 6106. This resin was also compatible with refrigerants, as well as with compressor lubricant. It was compounded in a similar fashion as nylon in Example 1, namely: 60% polypropylene resin and 40% molecular sieve Type 4A. The resin was heated above 174° C. The compounded resin had similar advantageous mechanical properties compared to the pure resin, and performs, structurally, close to that of a glass reinforced resin. Its properties are summarized in Table II. The values were determined by the same ASTM standards as provided in Table I.

[0049]

TABLE IIProperties of Reinforced PolypropyleneMaterial:Molecular SieveGlass BeadGlass FiberReinforcedReinforcedReinforcedProperty:PP NeatPolypropylenePolypropylenePolypropyleneLoading (%)037.541.939.4Hardness - Shore D66.874.665.675.4Tensile Modulus (psi)131242228023159321342977Tensile Displacement0.3300.1370.2740.222@ Max Load (i...

example 3

[0052]As may be seen in Table III, melt flow was reduced with sorbent reinforced nylon compared with nylon neat (pure polymer) or glass bead reinforced nylon. Nevertheless it was in a workable range and was higher than polypropylene. Melt flow of sorbent reinforced polypropylene was improved relative to polypropylene neat or glass reinforced polypropylene.

[0053]

TABLE IIIMelt Flow Properties of Sorbent Reinforced PolymersMelt Flow Index(g / 10 min)Molecular SieveGlass Bead(ASTM D 1238)NeatReinforcedReinforcedNylon56.314.755.5Polypropylene5.37.32.1

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Abstract

The invention relates to improved resin bonded sorbent compositions and articles of manufacture fabricated therewith, such as air conditioning and refrigeration components. The introduction of desiccants into resinous molding compositions enables the elimination of more conventional bagged desiccant containments. The novel molding compositions of the invention and parts fabricated therewith are multi-functional, beneficially combining structural, mechanical and adsorptive capabilities without requiring the usual reinforcing additives. Consequently, with the omission of reinforcing additives the novel molding compositions of the invention are further characterized by higher moisture adsorptive capacities by allowing for higher sorbent loading factors than prior adsorbent-containing molding compositions.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a Continuation-in-Part of application Ser. No. 11 / 040,471, filed Jan. 21, 2005.FIELD OF THE INVENTION[0002]The present invention relates generally to molding compositions, and more particularly, to improved injection molding compositions and articles of manufacture fabricated therefrom comprising water adsorbing additives in a resinous base.BACKGROUND OF INVENTION[0003]Incorporation of sorbents or desiccants into resin matrices has been revealed in several contexts. Formation of these resins into structural or functional shapes by various processes has been described in certain applications. Similarly, fillers have been added to structural molding resins. Low cost mineral or other fillers have been added to resin-containing compositions to extend the resin and reduce costs, while maintaining strength sufficient for the intended end-use application of the molded article. It is also a frequent practice to add reinforcing ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B01J20/26
CPCB01D53/28B01J20/08B01J20/103B01J20/12B01J20/18B01J20/183B01J20/20B01J20/28026B01J20/2803B01J20/28042F25B43/003F25B2500/21B01D2253/104B01D2253/108B01D2253/11F25B43/006B01D2253/102B01J20/00B01J20/22
Inventor POWERS, THOMASINCORVIA, SAMUEL A.
Owner MULTISORB TECH INC
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